PORTABLE TERMINAL APPARATUS, METHOD FOR CONTROLLING PORTABLE TERMINAL APPARATUS, COMMUNICATION SYSTEM, COMMUNICATION APPARATUS, AND METHOD FOR CONTROLLING COMMUNICATION APPARATUS

In order to solve the problem of performing data transmission between a server and a communication apparatus via a portable terminal apparatus at a high speed, the portable terminal apparatus is provided with: a first communication means which connects with a server on a network and communicates data, a second communication means which connects with the communication apparatus and performs data communication, a temporary storage means which temporarily stores data when relaying data communication between the server and the communication apparatus using the first communication means and the second communication means, and a control means which can control data communication performed by the first communication means and the second communication means asynchronously and in parallel when relaying data communication between the server and the communication apparatus.